TY - JOUR
T1 - Nickel removal from nickel-5,10,15,20-tetraphenylporphine using supercritical water in absence of catalyst
T2 - A basic study
AU - Mandal, Pradip Chandra
AU - Wahyudiono,
AU - Sasaki, Mitsuru
AU - Goto, Motonobu
N1 - Funding Information:
This work was supported by the Global COE program on Global Initiative Center for Pulsed Power Engineering. It was also supported by the Japan Petroleum Energy Center (JPEC) as a technological development project supported financially by the Ministry of Economy, Trade and Industry, Japan.
PY - 2011/3/15
Y1 - 2011/3/15
N2 - Reactions of nickel-5,10,15,20-tetraphenylporphine (Ni-TPP) were studied in supercritical water in the presence of toluene without the addition of any catalyst, H2 or H2S that is called a green process. The objective of this study was to remove nickel from Ni-TPP, the most common metal compound present in heavy crude, in high extent at low reaction time. All experiments were carried out in an 8.8mL batch reactor fabricated from hastelloy C-276. The ability of supercritical water (SCW) to remove nickel from Ni-TPP was studied at temperatures of 450-490°C and water partial pressures of 25-35MPa. Water partial pressure had no effect on overall conversion at temperatures of 450°C and a reaction time of 60min. The overall Ni-TPP conversion was 89.80%, a figure above that of previous catalytic studies. The percentage of nickel removal was estimated as a function of reaction time and temperature. It were temperature 490°C and pressure 25MPa at reaction time 90min where 65.68% nickel were removed by the action of SCW and toluene, as a co-solvent. It was determined that Ni-TPP undergoes a series of reactions, ending in demetallation and ring fragmentation. The obtained results suggest that supercritical water has a capability to remove nickel from Ni-TPP.
AB - Reactions of nickel-5,10,15,20-tetraphenylporphine (Ni-TPP) were studied in supercritical water in the presence of toluene without the addition of any catalyst, H2 or H2S that is called a green process. The objective of this study was to remove nickel from Ni-TPP, the most common metal compound present in heavy crude, in high extent at low reaction time. All experiments were carried out in an 8.8mL batch reactor fabricated from hastelloy C-276. The ability of supercritical water (SCW) to remove nickel from Ni-TPP was studied at temperatures of 450-490°C and water partial pressures of 25-35MPa. Water partial pressure had no effect on overall conversion at temperatures of 450°C and a reaction time of 60min. The overall Ni-TPP conversion was 89.80%, a figure above that of previous catalytic studies. The percentage of nickel removal was estimated as a function of reaction time and temperature. It were temperature 490°C and pressure 25MPa at reaction time 90min where 65.68% nickel were removed by the action of SCW and toluene, as a co-solvent. It was determined that Ni-TPP undergoes a series of reactions, ending in demetallation and ring fragmentation. The obtained results suggest that supercritical water has a capability to remove nickel from Ni-TPP.
KW - Batch reactor
KW - Demetallation
KW - Ni-TPP
KW - Ring fragmentation
KW - Supercritical water
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U2 - 10.1016/j.jhazmat.2011.01.059
DO - 10.1016/j.jhazmat.2011.01.059
M3 - Article
C2 - 21300437
AN - SCOPUS:79951836171
SN - 0304-3894
VL - 187
SP - 600
EP - 603
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -